There's something basic I don't understand. Let's say I'm looking at a 
regular WWW page with Mosaic. I see a link which points to a VRML file. I 
choose it, and this fires up my VRML reader. I interact with this 3D world 
for a while, and while doing so I perform some sort of action that is 
supposed to load another WWW page. 
The question I have, is how does the VRML reader notify it's calling program 
(Mosaic) that it should load a new page?
Thanks.